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class18_w08 - Photochemical smog Primary pollutants NO CO...

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Photochemical smog Primary pollutants ·NO , CO , CH 4 , volatile organic carbon ( VOCs ), SO 2 [sources: internal combustion engines, electric power plants, evaporation of solvents] +O 2 +hv O 3 , HNO 3 , oxidation products of organics (aldehydes, acids, etc etc) [these are the secondary pollutants ]
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Ground-level Air Pollution Urban air pollution in Mexico City possibly the worst in the world thermal inversion from Altiplano topography surface cools at night cool surface layer gets trapped under warmer air during the day smoke + fog = “smog”
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Levels of gas-phase pollutants are regulated to minimize health effects Regulation is through Title II of the Clean Air Act, which regulates mobile sources
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Human health effects of NOx and O exposure
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Hydroxyl free radical is the key to reactivity in the troposphere H 2 O-soluble or fully oxidized molecules that do not either photolyze or react with ·OH, are removed from the troposphere without reacting. Either photodecomposition or reaction with ·OH produces a free radical species which goes on to react further.
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